Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 19 - Cellular Mechanisms of Development - Review Questions - Understand - Page 397: 2

Answer

D.

Work Step by Step

Determination may come from external (B.) and/or internal (A.) causes, so D. is the best choice. C. simply does not happen in the normal case and, so, is wrong.
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